As per the vocabulary defined at http://schema.org/Person, this is what it looks like when you Google a person that has a profile filled out.

Unless you are John Smith, it can be pretty easy to pop right up. This is an example of a Google Profile and we expect the new +1 profiles to be similar. There is also the promise of 3rd party sites being able to feed this type of information to Google, provided it is marked up with valid Microdata.